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From GitBox <...@apache.org>
Subject [GitHub] jai1 closed pull request #1713: Fix: deadlock while closing non-persistent topic
Date Wed, 02 May 2018 08:28:42 GMT
jai1 closed pull request #1713: Fix: deadlock while closing non-persistent topic
URL: https://github.com/apache/incubator-pulsar/pull/1713

This is a PR merged from a forked repository.
As GitHub hides the original diff on merge, it is displayed below for
the sake of provenance:

As this is a foreign pull request (from a fork), the diff is supplied
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diff --git a/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/nonpersistent/NonPersistentTopic.java
index 44a9e14434..5d6b4baf66 100644
--- a/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/nonpersistent/NonPersistentTopic.java
+++ b/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/nonpersistent/NonPersistentTopic.java
@@ -462,8 +462,12 @@ void removeSubscription(String subscriptionName) {
         FutureUtil.waitForAll(futures).thenRun(() -> {
             log.info("[{}] Topic closed", topic);
-            brokerService.pulsar().getExecutor().submit(() -> brokerService.removeTopicFromCache(topic));
-            closeFuture.complete(null);
+            // unload topic iterates over topics map and removing from the map with the same
thread creates deadlock.
+            // so, execute it in different thread
+            brokerService.executor().execute(() -> {
+                brokerService.removeTopicFromCache(topic);
+                closeFuture.complete(null);
+            });
         }).exceptionally(exception -> {
             log.error("[{}] Error closing topic", topic, exception);
             isFenced = false;


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